The Absorption Spectra of Ga, In, Mn, Cr, Ni and Co in Under-Water Sparks

The absorption of gallium, indium, manganese, chromium, nickel and cobalt has been studied in under-water spark spectra. Many new lines, not previously found in absorption spectra, have been located. The results confirm and extend the observations on the absorption of these elements in the vapor state. For indium and gallium they confirm the conclusion that the normal state of the atom is the $2p$ state and for manganese, the conclusion that the ground level of the valence electron is the $1s$ septet level. For chromium, nickel and cobalt they afford a verification of the assignment of lines and arrangement of terms with respect to the ground level as given by Catalan and Gieseler for chromium, by Bechert and Sommer for nickel and by Catalan and Bechert for cobalt.